Neoplasia — MCQs

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 591: What is the most common vascular tumor in patients with AIDS?

A. Kaposi sarcoma (Correct Answer)
B. Angiosarcoma
C. Lymphangioma
D. Lymphoma

Explanation: **Explanation:** **Kaposi Sarcoma (KS)** is the most common neoplasm in patients with AIDS [1]. It is a vascular tumor caused by **Human Herpesvirus 8 (HHV-8)**, also known as Kaposi Sarcoma-associated Herpesvirus (KSHV) [1]. In the context of HIV, it is classified as an AIDS-defining illness. The pathogenesis involves HHV-8 infecting endothelial cells, leading to spindle cell proliferation, neoangiogenesis, and an inflammatory infiltrate. It typically presents as multifocal, purplish-red cutaneous nodules or plaques [2], but can also involve the viscera (especially the GI tract and lungs). **Analysis of Incorrect Options:** * **Angiosarcoma:** A highly malignant vascular tumor unrelated to HIV [3]. It most commonly occurs in the scalp of elderly patients or as a complication of chronic lymphedema (Stewart-Treves syndrome) or prior radiation [3]. * **Lymphangioma:** A benign malformation of lymphatic vessels, usually congenital (e.g., cystic hygroma) and not associated with immunodeficiency. * **Lymphoma:** While Non-Hodgkin Lymphoma (specifically Diffuse Large B-cell and Burkitt lymphoma) is the *second* most common malignancy in AIDS [1], it is a hematologic malignancy, not a vascular tumor. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Characterized by "slit-like" vascular spaces containing extravasated RBCs and spindle-shaped cells [2]. * **Four Clinical Types:** Classic (elderly Mediterranean men), Endemic (African), Iatrogenic (transplant-related), and Epidemic (AIDS-associated). * **Treatment:** Highly Active Antiretroviral Therapy (HAART) often leads to regression of lesions in AIDS patients. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 261-262. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 526-527. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 527-528.

Question 592: Dermoid cysts arise from which type of cell?

A. Pluripotent cell
B. Totipotent cell (Correct Answer)
C. Ectoderm
D. Mesoderm

Explanation: **Explanation:** **Dermoid cysts**, also known as **Mature Cystic Teratomas**, are the most common germ cell tumors of the ovary [1, 2]. They arise from **Totipotent cells** (germ cells). 1. **Why Totipotent cell is correct:** A totipotent cell has the capacity to differentiate into any of the three germ layers: **ectoderm, mesoderm, and endoderm** [1, 5]. Because dermoid cysts characteristically contain tissues derived from all three layers (e.g., hair/skin from ectoderm, muscle/cartilage from mesoderm, and intestinal epithelium from endoderm), they must originate from a cell with the highest level of potency—the totipotent germ cell. 2. **Why other options are incorrect:** * **Pluripotent cells:** While these can form all three germ layers, the term "totipotent" is traditionally preferred in the context of germ cell tumors like teratomas to signify the ability to form both embryonic and extra-embryonic tissues. * **Ectoderm & Mesoderm:** These are committed germ layers. If a tumor arose solely from ectoderm, it would not contain the fat, bone, or respiratory lining typically found in a dermoid cyst. **High-Yield Clinical Pearls for NEET-PG:** * **Rokistansky’s Protuberance:** The solid node within the cyst where hair and teeth are often concentrated. * **Most common complication:** Ovarian torsion. * **Malignant Transformation:** Occurs in <2% of cases, most commonly into **Squamous Cell Carcinoma** [3]. * **Struma Ovarii:** A specialized teratoma composed entirely of mature thyroid tissue, which can lead to hyperthyroidism [2]. * **Radiology:** Presence of fat and calcification (teeth) on a CT scan is diagnostic. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Female Genital Tract Disease, pp. 480-481. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, p. 1034. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1033-1034.

Question 593: In which of the following tumors is alpha-fetoprotein elevated?

A. Choriocarcinoma
B. Neuroblastoma
C. Hepatocellular carcinoma (Correct Answer)
D. Seminoma

Explanation: **Explanation:** **Alpha-fetoprotein (AFP)** is a glycoprotein normally synthesized by the fetal liver and yolk sac. In adults, it serves as a highly specific **tumor marker** when its levels are significantly elevated, primarily associated with germ cell tumors and primary liver malignancies. **Why Hepatocellular Carcinoma (HCC) is correct:** AFP is the gold-standard serum marker for HCC [1]. It is produced by the malignant hepatocytes as they undergo dedifferentiation into a fetal-like state. A level >400 ng/mL in a patient with a liver mass is highly suggestive of HCC. **Analysis of Incorrect Options:** * **Choriocarcinoma:** This is a gestational trophoblastic disease characterized by the elevation of **beta-hCG** [2]. It does not produce AFP. * **Neuroblastoma:** This childhood tumor of the adrenal medulla/sympathetic chain is associated with elevated urinary catecholamine metabolites (**VMA and HVA**) and **Neuron-Specific Enolase (NSE)**. * **Seminoma:** This is a "pure" germ cell tumor. While it may occasionally show mild elevations of beta-hCG [3], it is characteristically **AFP-negative**. An elevated AFP in a suspected seminoma indicates the presence of a non-seminomatous component (like a Yolk Sac Tumor). **High-Yield Clinical Pearls for NEET-PG:** * **Yolk Sac Tumor (Endodermal Sinus Tumor):** This is the other major tumor where AFP is significantly elevated (often >1000 ng/mL). Look for **Schiller-Duval bodies** on histology. * **Non-neoplastic causes of elevated AFP:** Cirrhosis, chronic hepatitis, and pregnancy (especially neural tube defects). * **Screening:** In high-risk patients (Cirrhosis/Hepatitis B), AFP is used alongside ultrasonography for HCC screening [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 399-400. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1035-1036. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 512-513.

Question 594: What is the most common virus causing tumors in humans?

A. Herpes Simplex Virus (HSV)
B. Human Papillomavirus (HPV) (Correct Answer)
C. Epstein-Barr Virus (EBV)
D. Human T-lymphotropic Virus (HTLV)

Explanation: **Explanation:** **Human Papillomavirus (HPV)** is the most common virus associated with human neoplasia worldwide [1]. Its high prevalence is due to its role in causing a wide spectrum of tumors, ranging from benign cutaneous warts (Verruca vulgaris) to malignant cancers [1], [3]. High-risk strains (HPV 16 and 18) are the primary drivers of cervical carcinoma, as well as significant proportions of oropharyngeal, anal, vulvar, and penile cancers [1], [2]. The oncogenic potential of HPV lies in its **E6 and E7 oncoproteins**, which inhibit the tumor suppressor proteins **p53 and RB**, respectively, leading to uncontrolled cell cycle progression [4], [5]. **Analysis of Incorrect Options:** * **Herpes Simplex Virus (HSV):** While HSV-2 was historically suspected of playing a role in cervical cancer, it is now known to be a co-factor rather than a primary oncogenic driver. * **Epstein-Barr Virus (EBV):** EBV was the first virus identified to cause human cancer (Burkitt Lymphoma) [1]. While it is associated with various malignancies (Nasopharyngeal carcinoma, Hodgkin lymphoma), its overall population burden is lower than HPV [1]. * **Human T-lymphotropic Virus (HTLV-1):** This is the only retrovirus directly linked to human cancer (Adult T-cell Leukemia/Lymphoma), but it is geographically restricted (e.g., Japan, Caribbean) and relatively rare [1]. **High-Yield Clinical Pearls for NEET-PG:** * **HPV 6, 11:** Low-risk; associated with Condyloma acuminatum (genital warts) and Laryngeal papillomas [1], [3]. * **HPV 16, 18:** High-risk; HPV 16 is the most common subtype in Squamous Cell Carcinoma of the cervix [1], [5]. * **Molecular Hallmark:** Integration of the viral genome into the host DNA is a critical step in malignant transformation. * **Vaccination:** The quadrivalent/nonavalent vaccines target these high-risk strains to prevent primary infection and subsequent neoplasia [5]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 219-220. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 261-262. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Female Genital Tract Disease, pp. 466-467. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1007-1008. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 334-335.

Question 595: Which tumour marker is associated with a highly vascular tumour?

A. Desmin
B. Keratin (Correct Answer)
C. S100
D. Alpha-fetoprotein

Explanation: **Explanation:** The correct answer is **Keratin**. This question specifically refers to **Angiosarcoma**, a highly vascular malignant tumor of endothelial cells [1]. In certain high-grade variants, such as **Epithelioid Angiosarcoma**, the tumor cells mimic epithelial cells morphologically and can express **Cytokeratin**. This is a classic "trap" in pathology: while Keratin is typically a marker for epithelial tumors (carcinomas), its expression in a vascular tumor is a diagnostic hallmark of the epithelioid subtype [1]. **Analysis of Options:** * **A. Desmin:** This is an intermediate filament marker for **muscle differentiation** (smooth or skeletal). It is used to diagnose tumors like Rhabdomyosarcoma or Leiomyosarcoma, which are not primarily defined by vascularity. * **C. S100:** This is a marker for cells derived from the **neural crest**, including melanocytes, Schwann cells, and chondrocytes. It is highly sensitive for Melanoma and Nerve Sheath Tumors (Schwannoma/Neurofibroma). * **D. Alpha-fetoprotein (AFP):** This is a serum tumor marker used for **Hepatocellular Carcinoma (HCC)** and **Yolk Sac Tumors**. While HCC is a vascular tumor, AFP is a secretory protein, not an immunohistochemical structural marker used to define the vascular nature of the cells in this context. **NEET-PG High-Yield Pearls:** * **Vascular Markers:** The most specific markers for vascular tumors (endothelial origin) are **CD31** (most specific), **CD34**, and **ERG** [1]. * **Epithelioid Angiosarcoma:** Always remember that this specific vascular tumor can be **Cytokeratin positive**, potentially leading to a misdiagnosis of carcinoma [1]. * **Angiosarcoma Associations:** Often associated with chronic lymphedema (Stewart-Treves Syndrome), post-radiation therapy, or exposure to Vinyl Chloride/Thorotrast (Liver Angiosarcoma). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 523-524, 527-528.

Question 596: Perineural spread is a characteristic feature of which of the following tumors?

A. Adenoid cystic carcinoma (Correct Answer)
B. Pleomorphic adenoma
C. Mucoepidermoid carcinoma
D. Warthin's tumor

Explanation: **Explanation:** **1. Why Adenoid Cystic Carcinoma (ACC) is correct:** Adenoid cystic carcinoma is a slow-growing but highly aggressive malignant tumor of the salivary glands [1]. Its most defining pathological characteristic is **perineural invasion (PNI)**—the tendency of tumor cells to track along the nerve sheaths. This occurs because the tumor cells express specific neurotrophic factors (like BDNF) that facilitate migration toward nerves. Clinically, this manifests as localized pain, facial nerve palsy, or paresthesia, and it often leads to local recurrence even after surgical resection with "clear" margins. **2. Why the other options are incorrect:** * **Pleomorphic Adenoma:** This is the most common **benign** salivary gland tumor. While it can have an irregular capsule (leading to recurrence if enucleated), it does not exhibit infiltrative behaviors like perineural spread. * **Mucoepidermoid Carcinoma:** This is the most common **malignant** salivary gland tumor [1]. While it is invasive, its hallmark is a mixture of mucous, intermediate, and epidermoid cells, rather than a specific predilection for nerves. * **Warthin’s Tumor (Papillary Cystadenoma Lymphomatosum):** This is a strictly **benign** tumor, almost exclusively found in the parotid gland. It is characterized by a double layer of oncocytic epithelium and a dense lymphoid stroma. **3. NEET-PG High-Yield Pearls:** * **Microscopy of ACC:** Look for the **"Cribriform pattern"** (Swiss-cheese appearance) where cells surround cylindrical spaces containing basement membrane-like material. * **Most common site:** Minor salivary glands (especially the palate) [1]. * **Prognosis:** It has a deceptively indolent course but a poor long-term prognosis due to late distant metastasis (most commonly to the **Lungs** via hematogenous spread). * **Other tumors with Perineural Spread:** Squamous cell carcinoma of the skin, Pancreatic adenocarcinoma, and Prostate cancer. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 753-755.

Question 597: Alcohol abuse is associated with an increased risk of all the following types of cancer EXCEPT?

A. Breast
B. Esophageal
C. Liver
D. Cervical (Correct Answer)

Explanation: Alcohol is a well-established Group 1 carcinogen. The correct answer is **Cervical cancer**, as its primary and necessary etiological factor is persistent infection with High-Risk **Human Papillomavirus (HPV)** types 16 and 18, rather than alcohol consumption [1]. **Why the other options are associated with alcohol:** * **Breast Cancer:** Alcohol increases serum **estrogen** levels and interferes with folate absorption. Even moderate intake is a significant risk factor for estrogen-receptor-positive breast cancer. * **Esophageal Cancer:** Alcohol (especially when combined with smoking) is a potent risk factor for **Squamous Cell Carcinoma**. Acetaldehyde, a metabolite of ethanol, causes direct DNA damage to the squamous epithelium. * **Liver Cancer:** Chronic alcohol abuse leads to alcoholic steatohepatitis and **cirrhosis**. Regenerative nodules in a cirrhotic liver provide the substrate for Hepatocellular Carcinoma (HCC) [2]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Metabolism:** Ethanol is converted to **Acetaldehyde** by alcohol dehydrogenase; acetaldehyde is the primary carcinogenic metabolite that inhibits DNA repair. 2. **Synergy:** There is a **multiplicative (synergistic) effect** between alcohol and tobacco for cancers of the oral cavity, pharynx, larynx, and esophagus. 3. **Other Alcohol-Linked Cancers:** Include Colorectal cancer and Pancreatic cancer (via chronic pancreatitis). 4. **Cervical Cancer Risk Factors:** Early age of coitus, multiple sexual partners, smoking, and OCP use (not alcohol) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 334-335. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 223-224.

Question 598: Which of the following is a protector or inhibitor of Apoptosis?

A. BCL-2 (Correct Answer)
B. BRCA
C. RB
D. TGF-β

Explanation: **Explanation:** Apoptosis (programmed cell death) is regulated by a balance between pro-apoptotic and anti-apoptotic proteins [1]. **BCL-2** is the prototypical **anti-apoptotic (protector)** protein [2]. It resides in the outer mitochondrial membrane and prevents the leakage of Cytochrome C into the cytosol by inhibiting pro-apoptotic proteins like BAX and BAK [1]. Overexpression of BCL-2 (commonly seen in Follicular Lymphoma due to t(14;18)) leads to cell survival despite genetic damage, promoting oncogenesis [3]. **Analysis of Incorrect Options:** * **BRCA (BRCA1/BRCA2):** These are **Tumor Suppressor Genes** involved in DNA repair (Homologous Recombination). Mutations lead to genomic instability, primarily increasing the risk of Breast and Ovarian cancers. * **RB (Retinoblastoma Gene):** Known as the "Governor of the Cell Cycle," RB is a **Tumor Suppressor Gene** that controls the G1 to S phase transition by sequestering the E2F transcription factor. * **TGF-β:** This is a potent **growth inhibitor** in normal epithelial cells. It arrests the cell cycle by activating CDK inhibitors (like p15 and p21). While it can induce apoptosis in some contexts, it is primarily classified as a growth inhibitor/cytokine rather than a direct anti-apoptotic protein like BCL-2. **High-Yield Clinical Pearls for NEET-PG:** * **Pro-apoptotic proteins:** BAX, BAK (The "Executioners"), Bim, Bid, Bad (BH3-only sensors) [2]. * **Anti-apoptotic proteins:** BCL-2, BCL-XL, MCL-1 [2]. * **Follicular Lymphoma:** Characterized by **t(14;18)**, which moves the BCL-2 gene to the IgH locus, causing its overexpression [3]. * **Intrinsic Pathway:** Also called the Mitochondrial pathway; Cytochrome C + Apaf-1 + Caspase 9 = **Apoptosome** [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 64-67. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 310. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 310-311.

Question 599: Which of the following predisposes to testicular germ cell tumors?

A. Klinefelter syndrome
B. Testicular carcinoma in a sibling
C. Cryptorchidism
D. All the above (Correct Answer)

Explanation: **Explanation:** Testicular Germ Cell Tumors (TGCTs) arise from a precursor lesion called **Germ Cell Neoplasia In Situ (GCNIS)**. The development of these tumors is strongly linked to **Testicular Dysgenesis Syndrome (TDS)**, where environmental or genetic factors disrupt normal testicular development. * **Cryptorchidism (Undescended Testis):** This is the most significant clinical risk factor. It increases the risk of TGCT by **3 to 10 times** [2]. Importantly, the risk remains elevated even after surgical orchiopexy, and there is also a slightly increased risk in the contralateral, normally descended testis [1], [2]. * **Genetic Predisposition (Family History):** TGCTs have a strong familial clustering. The risk is highest among **siblings** (8- to 10-fold increase) compared to fathers and sons (4-fold increase). This suggests a strong polygenic inheritance pattern. * **Klinefelter Syndrome (47, XXY):** This cytogenetic abnormality is associated with a significantly higher risk of **extragonadal germ cell tumors**, particularly in the mediastinum. However, it also predisposes to primary testicular germ cell tumors due to underlying testicular dysgenesis and atrophy. **Clinical Pearls for NEET-PG:** 1. **Isochromosome 12p [i(12p)]:** This is the pathognomonic genetic alteration found in virtually all GCNIS and invasive TGCTs. 2. **Age Group:** TGCTs are the most common tumors in men aged 15–34 years. 3. **Infection Link:** Unlike many other cancers, there is no proven link between mumps orchitis and TGCT. 4. **Precursor:** GCNIS is the precursor for all TGCTs except Pediatric Yolk Sac Tumors, Teratomas, and Spermatocytic Tumors. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 976-977. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 508-509.

Question 600: Rosettes are characteristically seen in which of the following neoplasms?

A. Dysgerminoma
B. Melanoma
C. Retinoblastoma (Correct Answer)
D. Lymphoma

Explanation: **Explanation:** **Retinoblastoma** is the correct answer because it characteristically exhibits **Flexner-Wintersteiner rosettes** [1]. These are considered highly specific for retinoblastoma and represent an attempt at retinal differentiation [4]. Histologically, these rosettes consist of a ring of cuboidal or columnar cells surrounding a central clear lumen, which contains cytoplasmic extensions from the cells [1]. Another type of rosette, the **Homer Wright rosette** (pseudorosette with a central fibrillar core), can also be seen in retinoblastoma, as well as in other primitive neuroectodermal tumors like neuroblastoma and medulloblastoma [2]. **Analysis of Incorrect Options:** * **Dysgerminoma (A):** This is a germ cell tumor of the ovary characterized by nests of large, clear cells separated by fibrous septa containing **lymphocytic infiltrates**. It does not form rosettes. * **Melanoma (B):** While melanoma is the "great mimicker" and can show various patterns, its hallmark features include nests of atypical melanocytes (Zellballen-like), prominent eosinophilic nucleoli, and **intracellular melanin pigment**. * **Lymphoma (C):** Non-Hodgkin lymphomas typically present as a diffuse sheet of monotonous, discohesive round cells. They do not form organized architectural structures like rosettes. **High-Yield Clinical Pearls for NEET-PG:** * **Flexner-Wintersteiner Rosettes:** Specific for Retinoblastoma (Lumen is "Empty") [1]. * **Homer Wright Rosettes:** Seen in Neuroblastoma, Medulloblastoma, and Retinoblastoma (Lumen has "Hair/Fibrils") [2]. * **True Ependymal Rosettes:** Seen in Ependymoma (Lumen contains a blood vessel or is a true canal) [3]. * **Retinoblastoma Genetics:** Associated with the **RB1 gene** on chromosome **13q14**. It follows Knudson’s "two-hit" hypothesis [4]. * **Clinical Sign:** The most common presenting sign is **Leukocoria** (white pupillary reflex). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Eye, pp. 1341-1342. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 484-485. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1312-1313. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 737-738.

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